61291951 has 8 divisors (see below), whose sum is σ = 70742304. Its totient is φ = 52015200.

The previous prime is 61291949. The next prime is 61291961. The reversal of 61291951 is 15919216.

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 61291951 - 2¹ = 61291949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61291961) 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, 42640 + ... + 44053.

It is an arithmetic number, because the mean of its divisors is an integer number (8842788).

Almost surely, 2^61291951 is an apocalyptic number.

61291951 is a deficient number, since it is larger than the sum of its proper divisors (9450353).

61291951 is a wasteful number, since it uses less digits than its factorization.

61291951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86801.

The product of its digits is 4860, while the sum is 34.

The square root of 61291951 is about 7828.9176135657. The cubic root of 61291951 is about 394.2767323308.

The spelling of 61291951 in words is "sixty-one million, two hundred ninety-one thousand, nine hundred fifty-one".