61061691 has 8 divisors (see below), whose sum is σ = 82162960. Its totient is φ = 40334112.

The previous prime is 61061683. The next prime is 61061699. The reversal of 61061691 is 19616016.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (61061683) and next prime (61061699).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61061691 - 2³ = 61061683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61061699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93040 + ... + 93693.

It is an arithmetic number, because the mean of its divisors is an integer number (10270370).

Almost surely, 2^61061691 is an apocalyptic number.

61061691 is a deficient number, since it is larger than the sum of its proper divisors (21101269).

61061691 is a wasteful number, since it uses less digits than its factorization.

61061691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186845.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 61061691 is about 7814.1980394664. The cubic root of 61061691 is about 393.7823765768.

The spelling of 61061691 in words is "sixty-one million, sixty-one thousand, six hundred ninety-one".