1225707731 has 2 divisors, whose sum is σ = 1225707732. Its totient is φ = 1225707730.

The previous prime is 1225707661. The next prime is 1225707737. The reversal of 1225707731 is 1377075221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1225707731 - 2¹⁰ = 1225706707 is a prime.

It is a super-2 number, since 2×1225707731² = 3004718883666336722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1225707691 and 1225707700.

It is not a weakly prime, because it can be changed into another prime (1225707737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612853865 + 612853866.

It is an arithmetic number, because the mean of its divisors is an integer number (612853866).

Almost surely, 2^1225707731 is an apocalyptic number.

1225707731 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225707731 is an equidigital number, since it uses as much as digits as its factorization.

1225707731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20580, while the sum is 35.

The square root of 1225707731 is about 35010.1089829780. The cubic root of 1225707731 is about 1070.1934989386.

The spelling of 1225707731 in words is "one billion, two hundred twenty-five million, seven hundred seven thousand, seven hundred thirty-one".