61256123 has 4 divisors (see below), whose sum is σ = 62680728. Its totient is φ = 59831520.

The previous prime is 61256113. The next prime is 61256137. The reversal of 61256123 is 32165216.

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

It is a cyclic number.

It is not a de Polignac number, because 61256123 - 2¹² = 61252027 is a prime.

It is a super-2 number, since 2×61256123² = 7504625209982258, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61256092 and 61256101.

It is not an unprimeable number, because it can be changed into a prime (61256113) 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, 712238 + ... + 712323.

It is an arithmetic number, because the mean of its divisors is an integer number (15670182).

Almost surely, 2^61256123 is an apocalyptic number.

61256123 is a deficient number, since it is larger than the sum of its proper divisors (1424605).

61256123 is a wasteful number, since it uses less digits than its factorization.

61256123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1424604.

The product of its digits is 2160, while the sum is 26.

The square root of 61256123 is about 7826.6290955941. The cubic root of 61256123 is about 394.1998929857.

The spelling of 61256123 in words is "sixty-one million, two hundred fifty-six thousand, one hundred twenty-three".