61951551 has 8 divisors (see below), whose sum is σ = 82655664. Its totient is φ = 41274240.

The previous prime is 61951543. The next prime is 61951559. The reversal of 61951551 is 15515916.

It is an interprime number because it is at equal distance from previous prime (61951543) and next prime (61951559).

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

It is not a de Polignac number, because 61951551 - 2³ = 61951543 is a prime.

It is a congruent 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, 480 + ... + 11141.

It is an arithmetic number, because the mean of its divisors is an integer number (10331958).

Almost surely, 2^61951551 is an apocalyptic number.

61951551 is a deficient number, since it is larger than the sum of its proper divisors (20704113).

61951551 is a wasteful number, since it uses less digits than its factorization.

61951551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13401.

The product of its digits is 6750, while the sum is 33.

The square root of 61951551 is about 7870.9307581759. The cubic root of 61951551 is about 395.6860395376.

The spelling of 61951551 in words is "sixty-one million, nine hundred fifty-one thousand, five hundred fifty-one".