621615097 has 2 divisors, whose sum is σ = 621615098. Its totient is φ = 621615096.

The previous prime is 621615053. The next prime is 621615101. The reversal of 621615097 is 790516126.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 431974656 + 189640441 = 20784^2 + 13771^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621615097 is a prime.

It is not a weakly prime, because it can be changed into another prime (621615017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310807548 + 310807549.

It is an arithmetic number, because the mean of its divisors is an integer number (310807549).

Almost surely, 2^621615097 is an apocalyptic number.

It is an amenable number.

621615097 is a deficient number, since it is larger than the sum of its proper divisors (1).

621615097 is an equidigital number, since it uses as much as digits as its factorization.

621615097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 621615097 is about 24932.2100304004. The cubic root of 621615097 is about 853.4416844262.

The spelling of 621615097 in words is "six hundred twenty-one million, six hundred fifteen thousand, ninety-seven".