61953391 has 4 divisors (see below), whose sum is σ = 61970832. Its totient is φ = 61935952.

The previous prime is 61953383. The next prime is 61953413. The reversal of 61953391 is 19335916.

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 61953391 - 2³ = 61953383 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61953391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61953361) 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, 1270 + ... + 11203.

It is an arithmetic number, because the mean of its divisors is an integer number (15492708).

Almost surely, 2^61953391 is an apocalyptic number.

61953391 is a deficient number, since it is larger than the sum of its proper divisors (17441).

61953391 is a wasteful number, since it uses less digits than its factorization.

61953391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17440.

The product of its digits is 21870, while the sum is 37.

The square root of 61953391 is about 7871.0476431032. The cubic root of 61953391 is about 395.6899568735.

The spelling of 61953391 in words is "sixty-one million, nine hundred fifty-three thousand, three hundred ninety-one".