972491777 has 2 divisors, whose sum is σ = 972491778. Its totient is φ = 972491776.

The previous prime is 972491747. The next prime is 972491789. The reversal of 972491777 is 777194279.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 680218561 + 292273216 = 26081^2 + 17096^2 .

It is a cyclic number.

It is not a de Polignac number, because 972491777 - 2¹⁶ = 972426241 is a prime.

It is not a weakly prime, because it can be changed into another prime (972491747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 486245888 + 486245889.

It is an arithmetic number, because the mean of its divisors is an integer number (486245889).

Almost surely, 2^972491777 is an apocalyptic number.

It is an amenable number.

972491777 is a deficient number, since it is larger than the sum of its proper divisors (1).

972491777 is an equidigital number, since it uses as much as digits as its factorization.

972491777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1555848, while the sum is 53.

The square root of 972491777 is about 31184.8004162284. The cubic root of 972491777 is about 990.7452053372.

The spelling of 972491777 in words is "nine hundred seventy-two million, four hundred ninety-one thousand, seven hundred seventy-seven".