61899554 has 4 divisors (see below), whose sum is σ = 92849334. Its totient is φ = 30949776.

The previous prime is 61899527. The next prime is 61899559. The reversal of 61899554 is 45599816.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 55279225 + 6620329 = 7435^2 + 2573^2 .

It is a junction number, because it is equal to n+sod(n) for n = 61899499 and 61899508.

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 as a sum of consecutive naturals, namely, 15474887 + ... + 15474890.

Almost surely, 2^61899554 is an apocalyptic number.

61899554 is a deficient number, since it is larger than the sum of its proper divisors (30949780).

61899554 is a wasteful number, since it uses less digits than its factorization.

61899554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30949779.

The product of its digits is 388800, while the sum is 47.

The square root of 61899554 is about 7867.6269611618. The cubic root of 61899554 is about 395.5753065238.

The spelling of 61899554 in words is "sixty-one million, eight hundred ninety-nine thousand, five hundred fifty-four".