61013997 has 48 divisors (see below), whose sum is σ = 102336000. Its totient is φ = 34642080.

The previous prime is 61013977. The next prime is 61014001. The reversal of 61013997 is 79931016.

61013997 = 154² + 155² + ... + 571².

61013997 is a `hidden beast` number, since 610 + 1 + 39 + 9 + 7 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-61013997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61013957) 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 47 ways as a sum of consecutive naturals, for example, 306504 + ... + 306702.

It is an arithmetic number, because the mean of its divisors is an integer number (2132000).

Almost surely, 2^61013997 is an apocalyptic number.

It is an amenable number.

61013997 is a deficient number, since it is larger than the sum of its proper divisors (41322003).

61013997 is a wasteful number, since it uses less digits than its factorization.

61013997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398 (or 395 counting only the distinct ones).

The product of its (nonzero) digits is 10206, while the sum is 36.

The square root of 61013997 is about 7811.1456906141. The cubic root of 61013997 is about 393.6798248333.

The spelling of 61013997 in words is "sixty-one million, thirteen thousand, nine hundred ninety-seven".