61951553 has 8 divisors (see below), whose sum is σ = 65784960. Its totient is φ = 58139200.

The previous prime is 61951543. The next prime is 61951559. The reversal of 61951553 is 35515916.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61951553 - 2¹⁶ = 61886017 is a prime.

It is a super-2 number, since 2×61951553² = 7675989838223618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61951559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1028 + ... + 11178.

It is an arithmetic number, because the mean of its divisors is an integer number (8223120).

Almost surely, 2^61951553 is an apocalyptic number.

It is an amenable number.

61951553 is a deficient number, since it is larger than the sum of its proper divisors (3833407).

61951553 is a wasteful number, since it uses less digits than its factorization.

61951553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10527.

The product of its digits is 20250, while the sum is 35.

The square root of 61951553 is about 7870.9308852257. The cubic root of 61951553 is about 395.6860437956.

The spelling of 61951553 in words is "sixty-one million, nine hundred fifty-one thousand, five hundred fifty-three".