61561402 has 16 divisors (see below), whose sum is σ = 107021952. Its totient is φ = 26011440.

The previous prime is 61561397. The next prime is 61561417. The reversal of 61561402 is 20416516.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29973 + ... + 31960.

It is an arithmetic number, because the mean of its divisors is an integer number (6688872).

Almost surely, 2^61561402 is an apocalyptic number.

61561402 is a deficient number, since it is larger than the sum of its proper divisors (45460550).

61561402 is a wasteful number, since it uses less digits than its factorization.

61561402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62013.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 61561402 is about 7846.1074425475. The cubic root of 61561402 is about 394.8536594043.

Adding to 61561402 its reverse (20416516), we get a palindrome (81977918).

The spelling of 61561402 in words is "sixty-one million, five hundred sixty-one thousand, four hundred two".