721951487 has 2 divisors, whose sum is σ = 721951488. Its totient is φ = 721951486.

The previous prime is 721951459. The next prime is 721951499. The reversal of 721951487 is 784159127.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 721951487 - 2⁶ = 721951423 is a prime.

It is a super-2 number, since 2×721951487² = 1042427899163022338, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721951387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360975743 + 360975744.

It is an arithmetic number, because the mean of its divisors is an integer number (360975744).

Almost surely, 2^721951487 is an apocalyptic number.

721951487 is a deficient number, since it is larger than the sum of its proper divisors (1).

721951487 is an equidigital number, since it uses as much as digits as its factorization.

721951487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 44.

The square root of 721951487 is about 26869.1549364694. The cubic root of 721951487 is about 897.0899783674.

The spelling of 721951487 in words is "seven hundred twenty-one million, nine hundred fifty-one thousand, four hundred eighty-seven".