61621535 has 4 divisors (see below), whose sum is σ = 73945848. Its totient is φ = 49297224.

The previous prime is 61621517. The next prime is 61621589. The reversal of 61621535 is 53512616.

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 61621535 - 2⁶ = 61621471 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61621498 and 61621507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6162149 + ... + 6162158.

It is an arithmetic number, because the mean of its divisors is an integer number (18486462).

Almost surely, 2^61621535 is an apocalyptic number.

61621535 is a deficient number, since it is larger than the sum of its proper divisors (12324313).

61621535 is a wasteful number, since it uses less digits than its factorization.

61621535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12324312.

The product of its digits is 5400, while the sum is 29.

The square root of 61621535 is about 7849.9385347912. The cubic root of 61621535 is about 394.9821815388.

The spelling of 61621535 in words is "sixty-one million, six hundred twenty-one thousand, five hundred thirty-five".