1225731 has 16 divisors (see below), whose sum is σ = 1796256. Its totient is φ = 738816.

The previous prime is 1225729. The next prime is 1225759. The reversal of 1225731 is 1375221.

It is not a de Polignac number, because 1225731 - 2¹ = 1225729 is a prime.

It is a super-2 number, since 2×1225731² = 3004832968722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1225698 and 1225707.

It is not an unprimeable number, because it can be changed into a prime (1225331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1771 + ... + 2363.

It is an arithmetic number, because the mean of its divisors is an integer number (112266).

2^1225731 is an apocalyptic number.

1225731 is a deficient number, since it is larger than the sum of its proper divisors (570525).

1225731 is a wasteful number, since it uses less digits than its factorization.

1225731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662.

The product of its digits is 420, while the sum is 21.

The square root of 1225731 is about 1107.1273639469. The cubic root of 1225731 is about 107.0200271128.

The spelling of 1225731 in words is "one million, two hundred twenty-five thousand, seven hundred thirty-one".