61899553 has 4 divisors (see below), whose sum is σ = 61958848. Its totient is φ = 61840260.

The previous prime is 61899527. The next prime is 61899559. The reversal of 61899553 is 35599816.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61899553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61899559) 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, 28053 + ... + 30178.

It is an arithmetic number, because the mean of its divisors is an integer number (15489712).

Almost surely, 2^61899553 is an apocalyptic number.

It is an amenable number.

61899553 is a deficient number, since it is larger than the sum of its proper divisors (59295).

61899553 is a wasteful number, since it uses less digits than its factorization.

61899553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59294.

The product of its digits is 291600, while the sum is 46.

The square root of 61899553 is about 7867.6268976102. The cubic root of 61899553 is about 395.5753043936.

The spelling of 61899553 in words is "sixty-one million, eight hundred ninety-nine thousand, five hundred fifty-three".