101642251 has 4 divisors (see below), whose sum is σ = 103073904. Its totient is φ = 100210600.

The previous prime is 101642249. The next prime is 101642279. The reversal of 101642251 is 152246101.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 101642251 - 2¹ = 101642249 is a prime.

It is a super-2 number, since 2×101642251² = 20662294376694002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (101640251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 715720 + ... + 715861.

It is an arithmetic number, because the mean of its divisors is an integer number (25768476).

Almost surely, 2^101642251 is an apocalyptic number.

101642251 is a deficient number, since it is larger than the sum of its proper divisors (1431653).

101642251 is an equidigital number, since it uses as much as digits as its factorization.

101642251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1431652.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 101642251 is about 10081.7781665736. The cubic root of 101642251 is about 466.6859842910.

Adding to 101642251 its reverse (152246101), we get a palindrome (253888352).

The spelling of 101642251 in words is "one hundred one million, six hundred forty-two thousand, two hundred fifty-one".