61537021 has 16 divisors (see below), whose sum is σ = 76875904. Its totient is φ = 47957184.

The previous prime is 61537019. The next prime is 61537037. The reversal of 61537021 is 12073516.

It is a cyclic number.

It is not a de Polignac number, because 61537021 - 2¹ = 61537019 is a prime.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61537051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1051 + ... + 11143.

It is an arithmetic number, because the mean of its divisors is an integer number (4804744).

Almost surely, 2^61537021 is an apocalyptic number.

It is an amenable number.

61537021 is a deficient number, since it is larger than the sum of its proper divisors (15338883).

61537021 is a wasteful number, since it uses less digits than its factorization.

61537021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10180.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 61537021 is about 7844.5535883185. The cubic root of 61537021 is about 394.8015260982.

It can be divided in two parts, 615 and 37021, that added together give a square (37636 = 194²).

The spelling of 61537021 in words is "sixty-one million, five hundred thirty-seven thousand, twenty-one".