61540497 has 6 divisors (see below), whose sum is σ = 88891842. Its totient is φ = 41026992.

The previous prime is 61540489. The next prime is 61540499. The reversal of 61540497 is 79404516.

It can be written as a sum of positive squares in only one way, i.e., 36978561 + 24561936 = 6081^2 + 4956^2 .

It is not a de Polignac number, because 61540497 - 2³ = 61540489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61540499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3418908 + ... + 3418925.

It is an arithmetic number, because the mean of its divisors is an integer number (14815307).

Almost surely, 2^61540497 is an apocalyptic number.

It is an amenable number.

61540497 is a deficient number, since it is larger than the sum of its proper divisors (27351345).

61540497 is a wasteful number, since it uses less digits than its factorization.

61540497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6837839 (or 6837836 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 61540497 is about 7844.7751401809. The cubic root of 61540497 is about 394.8089595870.

The spelling of 61540497 in words is "sixty-one million, five hundred forty thousand, four hundred ninety-seven".