61620451 has 2 divisors, whose sum is σ = 61620452. Its totient is φ = 61620450.

The previous prime is 61620437. The next prime is 61620463. The reversal of 61620451 is 15402616.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61620451 - 2⁹ = 61619939 is a prime.

It is a super-3 number, since 3×61620451³ (a number of 24 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (61627451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30810225 + 30810226.

It is an arithmetic number, because the mean of its divisors is an integer number (30810226).

Almost surely, 2^61620451 is an apocalyptic number.

61620451 is a deficient number, since it is larger than the sum of its proper divisors (1).

61620451 is an equidigital number, since it uses as much as digits as its factorization.

61620451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 61620451 is about 7849.8694893610. The cubic root of 61620451 is about 394.9798654481.

The spelling of 61620451 in words is "sixty-one million, six hundred twenty thousand, four hundred fifty-one".