620551499 has 2 divisors, whose sum is σ = 620551500. Its totient is φ = 620551498.

The previous prime is 620551487. The next prime is 620551553. The reversal of 620551499 is 994155026.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-620551499 is a prime.

It is a super-2 number, since 2×620551499² = 770168325822294002, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (620581499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310275749 + 310275750.

It is an arithmetic number, because the mean of its divisors is an integer number (310275750).

Almost surely, 2^620551499 is an apocalyptic number.

620551499 is a deficient number, since it is larger than the sum of its proper divisors (1).

620551499 is an equidigital number, since it uses as much as digits as its factorization.

620551499 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97200, while the sum is 41.

The square root of 620551499 is about 24910.8711007865. The cubic root of 620551499 is about 852.9546536386.

The spelling of 620551499 in words is "six hundred twenty million, five hundred fifty-one thousand, four hundred ninety-nine".