61901291 has 4 divisors (see below), whose sum is σ = 61972752. Its totient is φ = 61829832.

The previous prime is 61901269. The next prime is 61901309. The reversal of 61901291 is 19210916.

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 61901291 - 2⁶ = 61901227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61901251) 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, 34415 + ... + 36168.

It is an arithmetic number, because the mean of its divisors is an integer number (15493188).

Almost surely, 2^61901291 is an apocalyptic number.

61901291 is a deficient number, since it is larger than the sum of its proper divisors (71461).

61901291 is an equidigital number, since it uses as much as digits as its factorization.

61901291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71460.

The product of its (nonzero) digits is 972, while the sum is 29.

The square root of 61901291 is about 7867.7373494544. The cubic root of 61901291 is about 395.5790066468.

The spelling of 61901291 in words is "sixty-one million, nine hundred one thousand, two hundred ninety-one".