61331497 has 4 divisors (see below), whose sum is σ = 61359876. Its totient is φ = 61303120.

The previous prime is 61331483. The next prime is 61331507. The reversal of 61331497 is 79413316.

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

It can be written as a sum of positive squares in 2 ways, for example, as 40208281 + 21123216 = 6341^2 + 4596^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61331497 is a prime.

It is a super-2 number, since 2×61331497² = 7523105048522018, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61331407) 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, 10654 + ... + 15367.

It is an arithmetic number, because the mean of its divisors is an integer number (15339969).

Almost surely, 2^61331497 is an apocalyptic number.

It is an amenable number.

61331497 is a deficient number, since it is larger than the sum of its proper divisors (28379).

61331497 is a wasteful number, since it uses less digits than its factorization.

61331497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28378.

The product of its digits is 13608, while the sum is 34.

The square root of 61331497 is about 7831.4428427972. The cubic root of 61331497 is about 394.3615108117.

The spelling of 61331497 in words is "sixty-one million, three hundred thirty-one thousand, four hundred ninety-seven".